Debugger: Remove gdbProc() accessor

Use member directly

Change-Id: Id7b67458d40e4f5ae4893101afac423d14dfdba7
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/debugger/gdb/gdbengine.h

@@ -649,7 +649,6 @@ protected:
     // Convenience Functions
     //
     QString errorMessage(QProcess::ProcessError error);
-    GdbProcess *gdbProc() const;
     void showExecutionError(const QString &message);
 
     static QByteArray tooltipIName(const QString &exp);